.223 Chambered Oly Arms

[C4IGrant]

A forum member contacted us about some extraction issues with his Oly Arms and asked if we could take a look at it and maybe ream the chamber with a 556 NATO reamer.

So the we get the upper in and the barrel is marked 556. We attempt to stick our reamer in it, but cannot get the alignment ring on the reamer to fit into the upper receiver. Puzzled by this we gently forced the ring into the receiver and then twisted it. The Oly receiver started to remove material from the delrin ring.

Working our way into the receiver, we got the reamer into the barrel and started to turn it. The amount of material we got back from the this barrel was amazing! To date, we have never seen this amount of material come back.

So not only was the chamber out of spec, the receiver was too.

Moral of the story, DO NOT BUY OLY ARMS!


C4

[markm]

Ooooh!! I can't wait to add this to my OLY nightmare story collection.

I used to post stories like this on TOS. And booger eaters would still advise shooters to ignore my replies since I didn't actually own an OLY.... as though I was just making this stuff up because I had nothing better to do in life.

[C4IGrant]

Ooooh!! I can't wait to add this to my OLY nightmare story collection.

I used to post stories like this on TOS. And booger eaters would still advise shooters to ignore my replies since I didn't actually own an OLY.... as though I was just making this stuff up because I had nothing better to do in life.

I knew that this thread would brighten your day!



C4

[decodeddiesel]

Thanks for posting that Grant, it's a real eye opener!

[C4IGrant]

Thanks for posting that Grant, it's a real eye opener!

You are welcome!


C4

[Spooky130]

Ooooh!! I can't wait to add this to my OLY nightmare story collection.

I used to post stories like this on TOS. And booger eaters would still advise shooters to ignore my replies since I didn't actually own an OLY.... as though I was just making this stuff up because I had nothing better to do in life.

I had an Oly. It worked OK. For a casual, two-box-a-year shooter it would work OK. That being said, I now know much more about the AR platform and wouldn't buy another one...

Spooky

[Iraqgunz]

Grant,

Thanks for that pic. I would say that the amount of material I am pulling out of our Bushmasters is approx. half of that.

[decodeddiesel]

Grant,

Thanks for that pic. I would say that the amount of material I am pulling out of our Bushmasters is approx. half of that.

Dude, you should take a pic of that next time you ream a Bushmaster. It would be nice to be able to show something like that to the Bushmaster fan club.

[Iraqgunz]

I am going to do more tomorrow and will try. Unfortunately I am photographically challenged and my pics won't look that good.

Dude, you should take a pic of that next time you ream a Bushmaster. It would be nice to be able to show something like that to the Bushmaster fan club.

[jmart]

Dude, you should take a pic of that next time you ream a Bushmaster. It would be nice to be able to show something like that to the Bushmaster fan club.

After viewing this thread, it got me off my ass and out to the workbench to make a cerrosafe cast of my BM's chamber.

I just took the measurements after waiting the required one-hour cool down time, and my throat/freebore diameter is right at .2265. Neck diameter is .2553 ( about 1:15 after making cast). It's very difficult to make a measurement of the freebore length because it's difficult eyeballing exactly where the rifling begins, but it looks very consistent with the example that Ned posted on his .223 vs 5.56 article in the Sep issue of SWAT (pg 68, chamber cast pics). This barrel was purchased in spring of 03. Round count is approx 3,000 but that's just a WAG.

Now I wonder if Grant reamed it whether or not any metal would come out, but hypothetically speaking, if it did remove some metal, what would be the conclusion?